MCQ
If $0.4\,gm\,\,NaOH$ is present in $ 1$ litre solution, then its $pH$ will be
- A$2$
- B$10$
- C$11$
- ✓$12$
✓
Answer
Correct option: D.
$12$
(d) $[NaOH] = \frac{{0.4}}{{40}} = 0.01\,M;\,\,\,\,\,[O{H^ - }] = {10^{ - 2}}\,M$
$[{H^ + }] = {10^{ - 12}},\,\,pH = - \log [{H^ + }] = 12$
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
Aq. solution of sodium cyanide is
The angular momentum of an electron depends on:
Pure ammonia is placed in a vessel at temperature where its dissociation constant ($\alpha $) is appreciable. At equilibrium
→Which of the following does not exists as ionic substance in solid state
The product $P$ is :
→For the following Assertion and Reason, the correct option is
→Assertion $(A)$ $:$ When Cu $(II)$ and sulphide ions are mixed, they react together extremely quickly to give a solid.
Reason $(R)$ $:$ The equilibrium constant of $Cu ^{2+}( aq )+ S ^{2-}( aq ) \rightleftharpoons \operatorname{CuS}( s )$ is high because the solubility product is low.
When $400\, \mathrm{~mL}$ of $0.2\, \mathrm{M} \,\mathrm{H}_{2} \mathrm{SO}_{4}$ solution is mixed with $600\, \mathrm{~mL}$ of $0.1\, \mathrm{M} \,\mathrm{NaOH}$ solution, the increase in temperature of the final solution is $....\,\times 10^{-2} \,\mathrm{~K}$. (Round off to the Nearest Integer).
→$\left[\right.$ Use $: \mathrm{H}^{+}(\mathrm{aq})+\mathrm{OH}^{-}(\mathrm{aq}) \rightarrow \mathrm{H}_{2} \mathrm{O}: \Delta_{\mathrm{\gamma}} \mathrm{H}=-57.1\, \mathrm{k} \mathrm{J} \,\mathrm{mol}^{-1}$
Specific heat of $\mathrm{H}_{2} \mathrm{O}=4.18 \mathrm{Jk}^{-} \mathrm{g}^{-}$
density of $\mathrm{H}_{2} \mathrm{O}=1.0\, \mathrm{~g} \mathrm{~cm}^{-3}$
Assume no change in volume of solution on mixing.]
Circle represents most basic atoms in these molecule. Which of the following is correct representation ?
A gaseous mixture contains $CH_4$ and $C_2H_6$ in equimolecular propotion. The weight of $2.24\, litres$ of this mixture at $S.T.P$ is :- .............. $\mathrm{g}$
→Lines in the hydrogen spectrum which appear in the infrared region of the electromagnetic Spectrum, then they are called as